Problem DEC750 freeze with 26.7 version

[droumanet]

After few days running, my DEC750 freeze.
Console port says something about
zfs: WARNING: Pool 'zroot' has encoutered an uncorrectable I/O failure and has been suspended

AI help me to check temperature was too high, so I changed place and now it seems to be ok (according to os-smart: max 68°C)

Anybody have an idea how to troubleshoot (console is not usable) ?

[Patrick M. Hausen]

Your SSD might be failing. Run a long SMART test. Also run a zpool scrub.

[droumanet]

I did many tests and there is no failure. AI suspected too much write on it, then I reduced rules log, rddtools and some settings.
Let see for next tests

[pfry]

[...]AI suspected too much write on it[...]

"Services: SMART" -> "Info", "Info type" = "Attributes", "View". Anything out of nominal? I have most rule logging enabled, and show 2.3TB written over nearly two years.

[droumanet]

It seems I've 12 TB in less than one year. Main of them are Outbound DNS level 3 (down to level 2).
This morning, here are statistics:

=== START OF SMART DATA SECTION ===
SMART/Health Information (NVMe Log 0x02, NSID 0xffffffff)
Critical Warning:                   0x00
Temperature:                        52 Celsius
Available Spare:                    100%
Available Spare Threshold:          10%
Percentage Used:                    13%
Data Units Read:                    662,615 [339 GB]
Data Units Written:                 24,519,123 [12.5 TB]
Host Read Commands:                 4,037,958
Host Write Commands:                465,833,667
Controller Busy Time:               4,513,538
Power Cycles:                       30
Power On Hours:                     4,677
Unsafe Shutdowns:                   24
Media and Data Integrity Errors:    0
Error Information Log Entries:      0
Warning  Comp. Temperature Time:    0
Critical Comp. Temperature Time:    0
Temperature Sensor 1:               66 Celsius
Temperature Sensor 2:               41 Celsius
Temperature Sensor 3:               52 Celsius
Thermal Temp. 1 Transition Count:   93
Thermal Temp. 1 Total Time:         4478

The main temperature of the firewall (in Dashboard) is 39.1°C, so 66°C for NVMe0 is strange, no?

[Patrick M. Hausen]

Passively cooled 66 C is not uncommon. Percentage used is at 13% so you still have more than ten years of specified life at your current write rate.

What model is this? It probably has a TBW (terabytes written) spec of 100 or so.

[droumanet]

Thanks Patrick !
You're right, it's a
Transcend TS256GMTE712A (série MTE712A)

I've made some write reduction (outbound DNS, tested rules, etc.) and since that, no more error.

Today
SMART/Health Information Log
============================
Critical Warning State:         0x00
 Available spare:               0
 Temperature:                   0
 Device reliability:            0
 Read only:                     0
 Volatile memory backup:        0
Temperature:                    325 K, 51.85 C, 125.33 F
Available spare:                100
Available spare threshold:      10
Percentage used:                13
Data units (512,000 byte) read: 858477
Data units written:             24738666
Host read commands:             4822576
Host write commands:            468806337
Controller busy time (minutes): 4513573
Power cycles:                   30
Power on hours:                 4823
Unsafe shutdowns:               24
Media errors:                   0
No. error info log entries:     0
Warning Temp Composite Time:    0
Error Temp Composite Time:      0
Temperature Sensor 1:           340 K, 66.85 C, 152.33 F
Temperature Sensor 2:           315 K, 41.85 C, 107.33 F
Temperature Sensor 3:           325 K, 51.85 C, 125.33 F
Temperature 1 Transition Count: 93
Temperature 2 Transition Count: 0
Total Time For Temperature 1:   4478
Total Time For Temperature 2:   0